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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of contractual amount of off-balance-sheet financial instruments
    September 30,     December 31,  
(in thousands)   2018     2017  
Commitments to extend credit   $ 233,920     $ 238,527  
Commitments to originate residential first and second mortgage loans     2,217       1,471  
Standby letters of credit     61,332       74,004  
Total     297,469       314,002